This repository contains a set of example applications (mostly Kafka applications) that use the Apicurio Registry as part of their workflow. The registry is typically used to store schemas used by Kafka serializer and deserializer classes. These serdes classes will fetch the schema from the registry for use during producing or consuming operations (to serializer, deserializer, or validate the Kafka message payload).

Each example in this repository attempts to demonstrate some specific use-case or configuration. There are numerous options available when integrating with the registry, and therefore the set of examples found here may not cover every configuration permutation.

A list of examples is included below, with descriptions and explanations of each covered use-case.

This example application demonstrates the basics of using the registry in a very simple Kafka publish/subscribe application using Apache Avro as the schema technology used to serialize and deserialize message payloads.

This example application demonstrates the basics of using the registry in a very simple Kafka publish/subscribe application using JSON Schema to validate message payloads when both producing and consuming them. JSON Schema is not a serialization technology, but rather is only used for validation. Therefore it can be enabled or disabled in the serializer and deserializer.

This example shows how Apicurio Registry serdes classes can be used along with Confluent serdes classes in a mixed application environment. In other words, some applications can be using Confluent classes while other applications can be using Apicurio Registry classes - and they can all work together seamlessly with just a little bit of extra configuration. This example is essentially the same as the Simple Avro Example, but using a Confluent serializer with an Apicurio Registry deserializer.

This example demonstrates how to use Avro as the schema and serialization technology while using a Java Bean as the Kafka message payload. This is essentially the same as the Simple Avro Example, but using a java bean instead of a GenericRecord as the message payload.

This example demonstrates how to use a custom Global ID strategy. The Global ID strategy is used by a producer (serializer) application to lookup (or create) the Schema it is using for serialization. Apicurio Registry comes with some useful implementations of the Global ID strategy out of the box, but it is possible to create your own. This example is essentially the same as the Simple Avro Example, except instead of using one of the default Apicurio Registry Global ID strategies, it uses a custom one.

This example application demonstrates how to use the Apicurio Registry maven plugin to pre-register an Avro schema so that it does not need to be embedded within the producer application. Note that this example will fail unless the maven plugin is executed before the Java application. See the javadoc in the example for details.

This example application demonstrates how to use the Apicurio Registry rest client to create, delete, or fetch schemas. This example contains two basic java application, one showing how to improve the logs by logging all the request and response headers and a basic example on how to use the client.

This example application showcases an scenario where Apache Avro messages are published to the same Kafka topic using different Avro schemas. This example uses the Apicurio Registry serdes classes to serialize and deserialize Apache Avro messages using different schemas, even if received in the same Kafka topic.

This is an example application that implements a REST API that consumes and produces CloudEvents. This example application showcases an experimental library from apicurio-registry project. This library is used to validate incoming and outgoing CloudEvents messages in the REST API. The validation is performed against json schemas that are stored in Apicurio Registry. For a more detailed explanation go here.